JP6530864B2 - LED lens - Google Patents

LED lens Download PDF

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JP6530864B2
JP6530864B2 JP2018523407A JP2018523407A JP6530864B2 JP 6530864 B2 JP6530864 B2 JP 6530864B2 JP 2018523407 A JP2018523407 A JP 2018523407A JP 2018523407 A JP2018523407 A JP 2018523407A JP 6530864 B2 JP6530864 B2 JP 6530864B2
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emission surface
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ソンビン キム、
ソンビン キム、
ビョンウク キム、
ビョンウク キム、
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エニーキャスティング カンパニー リミテッド
エニーキャスティング カンパニー リミテッド
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B3/00—Simple or compound lenses
    • G02B3/02—Simple or compound lenses with non-spherical faces
    • G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

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  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
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Description

本発明は、ＬＥＤから出る光を均一に拡散させることができるＬＥＤレンズに関する。   The present invention relates to an LED lens capable of uniformly diffusing light emitted from the LED.

一般に、ＬＥＤ（Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｏｄｅ）は、光変換効率が高いので消費電力が相対的に非常に低く、応答速度が速く、点灯回路が簡単であり、安全性に優れた長所のため室内外照明用光源として広く用いられている。   In general, LEDs (Light Emitting Diodes) have relatively high power conversion efficiency because they have a relatively low power consumption, quick response speed, simple lighting circuits, and excellent safety. It is widely used as a light source.

しかし、光源としてＬＥＤを用いる場合は、光が狭い領域に集中して発散する傾向にあるため、それを照明装置に適用するためには、光を広い領域に均一に分布するようにする必要がある。   However, when an LED is used as a light source, the light tends to be concentrated and emitted in a narrow area, so in order to apply it to a lighting device, the light needs to be uniformly distributed in a wide area. is there.

このような機能を遂行するＬＥＤレンズに関する代表的な先行技術としては、特許文献１がある。   As a typical prior art regarding the LED lens which performs such a function, there exists patent document 1. FIG.

しかし、特許文献１に係るＬＥＤレンズは、ＬＥＤの光軸近くで円形の帯状の暗部（周辺より暗い部分）が発生する問題があり、また、ＬＥＤの光軸部位でホットスポット（周辺より明るい部分）が発生する問題がある。   However, the LED lens according to Patent Document 1 has a problem that a circular strip dark part (darker than the periphery) occurs near the optical axis of the LED, and a hot spot (part brighter than the peripheral) in the optical axis part of the LED There is a problem that occurs).

米国特許第７３４８７２３号明細書U.S. Patent No. 7348723

本発明は、前記のような問題点を解決するためのものであって、ＬＥＤの光軸近くで円形の帯状の暗部が発生する現象と、ＬＥＤの光軸部位でのホットスポットが発生する現象を改善できるＬＥＤレンズを提供する。   The present invention is intended to solve the above-mentioned problems, a phenomenon in which a circular band-shaped dark portion occurs near the optical axis of the LED, and a phenomenon in which a hot spot occurs at the optical axis of the LED. To provide an LED lens that can improve the

本発明の一実施例に係るＬＥＤレンズは、ＬＥＤから出る光を均一に拡散させるためのＬＥＤレンズにおいて、前記ＬＥＤから出る光が前記レンズの内部に入射する入射面と、前記入射面を通して前記レンズの内部に入射した光を前記レンズの外部に出射させる出射面とを含み、前記出射面は、垂直断面上、前記ＬＥＤ側に凸な曲面形状を形成する第１出射面と、前記第１出射面の周囲に位置し、前記ＬＥＤの反対側に凸な曲面形状を形成する第２出射面とを含み、前記第１出射面と前記第２出射面の接続部分に存在する変曲点部位には、垂直断面上、上方に凸な形状を有する凸部が形成され、前記凸部は、平面上、前記ＬＥＤの光軸を中心に円形の形態で存在する変曲点を囲む円形の帯状に形成され得る。   An LED lens according to an embodiment of the present invention is an LED lens for uniformly diffusing the light emitted from the LED, wherein the lens through the incident surface through which the light emitted from the LED is incident to the inside of the lens and the incident surface And a first exit surface that forms a curved surface convex toward the LED in the vertical cross section, and the first exit surface. At a point of inflection existing at a connection portion between the first emission surface and the second emission surface, including a second emission surface located around the surface and forming a convex curved surface shape on the opposite side of the LED A convex portion having a convex shape on the vertical cross section is formed, and the convex portion is formed in a circular strip shape surrounding a point of inflection existing in a circular form around the optical axis of the LED on a plane. It can be formed.

また、本発明の一実施例に係るＬＥＤレンズは、前記出射面には、垂直断面上、上方に凸な形状を有し、平面上、円形の帯状を有する第１凸部と第２凸部がさらに形成され、前記第１ブロック部は、前記凸部から前記第１出射面側に所定距離離隔した状態で前記第１出射面上に形成され、前記第２凸部は、前記凸部から前記第２出射面側に所定距離離隔した状態で前記第２出射面上に形成され得る。   In the LED lens according to an embodiment of the present invention, the light emitting surface has a first convex portion and a second convex portion having a convex shape on the vertical cross section in a vertical cross section and having a circular band shape on a plane. Is further formed, the first block portion is formed on the first emission surface in a state of being separated by a predetermined distance from the convex portion toward the first emission surface side, and the second convex portion is formed from the convex portion The second light emitting device may be formed on the second light emitting surface in a state of being separated by a predetermined distance on the second light emitting surface side.

また、本発明の一実施例に係るＬＥＤレンズは、前記第１凸部と前記第２凸部は、垂直断面上、前記凸部を基準として互いに対称をなすことができる。   In the LED lens according to an embodiment of the present invention, the first convex portion and the second convex portion may be symmetrical with respect to the convex portion in a vertical cross section.

前記のような構成を有する本発明の一実施例に係るＬＥＤレンズによれば、ＬＥＤの光軸近くで円形の帯状の暗部が発生する現象と、ＬＥＤの光軸部位でホットスポットが発生する現象を改善できる効果がある。   According to the LED lens according to the embodiment of the present invention having the above-described configuration, a phenomenon that a circular band-shaped dark part occurs near the optical axis of the LED and a phenomenon that a hot spot occurs at the optical axis part of the LED Have the effect of improving

本発明に係る効果は、以上において言及された効果に制限されず、言及されていないまた他の効果は、請求の範囲と詳細な説明の記載から本発明の属する技術の分野における通常の知識を有する者に明確に理解され得るだろう。   The effects according to the present invention are not limited to the effects mentioned above, and the other effects not mentioned refer to the general knowledge in the field of technology to which the present invention belongs from the description of the claims and the detailed description. It can be clearly understood by those who possess it.

本発明の一実施例に係るＬＥＤレンズを示す垂直断面図である。It is a vertical sectional view showing the LED lens concerning one example of the present invention. 図１の概略的な平面図である。FIG. 2 is a schematic plan view of FIG. 1; 図１に係るレンズを通して出射する光の配光分布をシミュレーションした結果を示す図である。It is a figure which shows the result of having simulated light distribution of the light radiate | emitted through the lens which concerns on FIG. 図３の「Ｂ」部分を拡大した図である。It is the figure which expanded "B" part of FIG. 図１の「Ａ」領域を拡大した図である。It is the figure which expanded "A" area | region of FIG. 本発明の他の実施例に係るＬＥＤレンズを示す垂直断面図である。FIG. 6 is a vertical cross-sectional view of an LED lens according to another embodiment of the present invention. 図６の「Ａ」領域を拡大した図である。It is the figure which expanded "A" area | region of FIG. 図６の概略的な平面図である。FIG. 7 is a schematic plan view of FIG. 6; 本発明のまた他の実施例に係るＬＥＤレンズを示す垂直断面図である。FIG. 10 is a vertical sectional view showing an LED lens according to another embodiment of the present invention. 図９の概略的な平面図である。FIG. 10 is a schematic plan view of FIG. 9; 図９に係るレンズを通して出射する光の配光分布をシミュレーションした結果を示す図である。It is a figure which shows the result of having simulated light distribution of the light radiate | emitted through the lens which concerns on FIG. 図１１の「Ｂ」部分を拡大した図である。It is the figure which expanded "B" part of FIG.

以下、添付の図面を参照して、本発明に係る実施例について、本発明の属する技術の分野における通常の知識を有する者が容易に実施できるように詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art of the present invention can easily carry out the embodiments.

本発明は、様々な修正および変形を許容しながらも、その特定の実施例は図面で例示されて示され、以下において詳細に説明される。しかし、本発明を開示された特別な形態に限定しようとする意図はなく、むしろ、本発明は、請求項により定義された本発明の思想に合致する全ての修正、均等および代用を含む。   While the invention is susceptible to various modifications and variations, specific embodiments thereof are illustrated and shown in the drawings and will be described in detail below. However, there is no intention to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and alternatives consistent with the spirit of the invention as defined by the claims.

一方、添付の図面において、厚さおよび大きさは、明細書の明確性のために誇張されたものであり、従って、本発明は、添付の図面に示された相対的な大きさや厚さにより制限されない。   On the other hand, in the accompanying drawings, the thickness and size are exaggerated for clarity of the description, and thus the present invention is not limited to the relative sizes and thicknesses shown in the attached drawings. It is not restricted.

図１は、本発明の一実施例に係るＬＥＤレンズを示す垂直断面図である。   FIG. 1 is a vertical sectional view showing an LED lens according to an embodiment of the present invention.

図１を参照すると、本発明の一実施例に係るＬＥＤ（Ｌｉｇｈｔ Ｅｍｉｔｔｉｎｇ Ｄｉｏｄｅ）レンズ１０は、ＬＥＤ１１から出る光Ｌ１がレンズ１０の内部に入射する入射面２０と、入射面２０を通してレンズ１０の内部に入射した光Ｌ２をレンズ１０の外部に出射させる出射面３０とを含む。   Referring to FIG. 1, an LED (Light Emitting Diode) lens 10 according to an embodiment of the present invention includes an incident surface 20 through which light L1 emitted from the LED 11 enters the lens 10 and an inner surface of the lens 10 through the incident surface 20. And an exit surface 30 for emitting the light L2 incident on the outside of the lens 10.

また、本発明の一実施例に係るＬＥＤレンズ１０は、底面１３、底面１３の中心部に形成されてＬＥＤ１１を収容する収容溝１４、底面１３と出射面３０を連結し、出射面３０から外側に突出するフランジ１５、フランジ１５の下部に設けられたレッグ１７を含む。   Further, the LED lens 10 according to an embodiment of the present invention has a bottom surface 13, an accommodation groove 14 formed at a central portion of the bottom surface 13 and accommodating the LED 11, and connects the bottom surface 13 and the emission surface 30. And a leg 17 provided at the lower part of the flange 15.

ここで、入射面２０は、収容溝１４の内面からなり得る。   Here, the incident surface 20 may be an inner surface of the receiving groove 14.

即ち、収容溝１４に収容されたＬＥＤ１１から出る光Ｌ１は、収容溝１４の内面である入射面２０を通してレンズ１０の内部に入射できる。   That is, the light L1 emitted from the LED 11 accommodated in the accommodation groove 14 can be incident on the inside of the lens 10 through the incident surface 20 which is the inner surface of the accommodation groove 14.

また、出射面３０は、ＬＥＤ１１側に凸な曲面形状、即ち、下方に凸な曲面形状を有する第１出射面３２と、第１出射面３２の周囲に位置し、ＬＥＤ１１の反対側に凸な曲面形状、即ち、上方に凸な曲面形状を有する第２出射面３４とを含み、第１出射面３２と第２出射面３４の接続部分には、変曲点３７が存在する。   Further, the emission surface 30 is positioned around the first emission surface 32 having a curved surface shape convex toward the LED 11 side, that is, a curved surface shape convex downward, and convex on the opposite side of the LED 11 An inflection point 37 is present at the connecting portion between the first exit surface 32 and the second exit surface 34 including the second exit surface 34 having a curved surface shape, that is, a curved surface shape convex upward.

このように、出射面３０が、下方に凸な曲面形状を有する第１出射面３２と、上方に凸な曲面形状を有する第２出射面３４とを含む場合、入射面２０を通してレンズ１０の内部に入射した光Ｌ２は、均一に拡散された状態で出射面３０を通してレンズ１０の外部に出射できるようになる。   As described above, in the case where the emission surface 30 includes the first emission surface 32 having a curved surface shape convex downward and the second emission surface 34 having a curved surface shape convex upward, the inside of the lens 10 through the incident surface 20 The light L 2 incident on the light L 2 can be emitted to the outside of the lens 10 through the emission surface 30 in a uniformly diffused state.

図２は、図１の概略的な平面図である。   FIG. 2 is a schematic plan view of FIG.

図２から見られるように、入射面２０と出射面３０の平面上の形状は、ＬＥＤ１１の光軸１２を中心に略円形の形状を有してよく、フランジ１５は、出射面３０から両側に突出し得る。   As can be seen from FIG. 2, the planar shape of the entrance surface 20 and the exit surface 30 may have a substantially circular shape centering on the optical axis 12 of the LED 11, and the flanges 15 are located on both sides from the exit surface 30. It can protrude.

第１出射面３２は、出射面３０の平面上の領域中、ＬＥＤ１１の光軸１２を含む中心領域であり、第２出射面３４は、出射面３０の平面上の領域中、第１出射面３２を囲む縁領域であって、第１出射面３２と第２出射面３４との間に存在する変曲点３７は、平面上、ＬＥＤ１１の光軸１２を中心とする円形の形態で存在する。   The first emission surface 32 is a central region including the optical axis 12 of the LED 11 in the region on the plane of the emission surface 30, and the second emission surface 34 is the first surface in the region on the plane of the emission surface 30. The inflection point 37 which is an edge area surrounding the light emitting surface 32 and exists between the first light emitting surface 32 and the second light emitting surface 34 exists in a circular form centered on the optical axis 12 of the LED 11 on a plane. .

図３は、図１に係るレンズを通して出射する光の配光分布をシミュレーションした結果を示す図であり、図４は、図３の「Ｂ」部分を拡大した図である。   FIG. 3 is a view showing a simulation result of light distribution of light emitted through the lens according to FIG. 1, and FIG. 4 is an enlarged view of a "B" portion of FIG.

図３および図４を参照すると、図１に係るＬＥＤレンズ１０による配光分布は、ＬＥＤ１１の光軸１２近くで略円形の帯状の周辺より暗い部分である暗部ｂが発生することを確認することができ、また、ＬＥＤ１１の光軸１２部位では、周辺より明るい部分であるホットスポットｈが発生することを確認することができるが、前記のような暗部ｂとホットスポットｈにより光の均一度が落ちる問題が発生する。   With reference to FIGS. 3 and 4, it is confirmed that the light distribution distribution by the LED lens 10 according to FIG. 1 generates a dark portion b which is a darker portion than a substantially circular strip near the optical axis 12 of the LED 11. In addition, it is possible to confirm that the hot spot h which is brighter than the periphery is generated at the optical axis 12 part of the LED 11, but the light uniformity is made by the dark part b and the hot spot h as described above. The falling problem occurs.

図５は、変曲点部位を拡大した図であって、図１の「Ａ」領域を拡大した図である。   FIG. 5 is an enlarged view of a point of inflection, which is an enlarged view of the “A” region of FIG. 1.

図５から見られるように、第１出射面３２を通してレンズ１０の外部に出射する光Ｌ３と、第２出射面３４を通してレンズ１０の外部に出射する光Ｌ４は、略変曲点３７の上部領域で暗部領域Ｃを形成するようになるが、このような暗部領域Ｃにより配光分布上で略円形の帯状の暗部ｂが光軸１２近くに発生する。   As can be seen from FIG. 5, the light L 3 emitted to the outside of the lens 10 through the first emission surface 32 and the light L 4 emitted to the exterior of the lens 10 through the second emission surface 34 Thus, the dark area C is formed, but the dark area C generates a substantially circular strip dark area b near the optical axis 12 on the light distribution.

これは、第１出射面３２と第２出射面３４の形状、即ち、第１出射面３２は、下方に凸な曲面形状を有するのに対し、第２出射面３４は、上方に凸な曲面形状を有するため発生する現象である。   This is because the shapes of the first emission surface 32 and the second emission surface 34, that is, the first emission surface 32 has a curved surface shape that is convex downward, whereas the second emission surface 34 is a curved surface that is convex upward. It is a phenomenon that occurs because it has a shape.

詳細に説明すると、図面から見られるように、第１出射面３２は、下方に凸な曲面形状を有し、第２出射面３４は、上方に凸な曲面形状を有するため、第１出射面３２を通してレンズ１０の外部に出射する光Ｌ３の屈折角と、第２出射面３２を通してレンズ１０の外部に出射する光Ｌ４の屈折角に差が発生するようになるが、これによって、第１出射面３２と第２出射面３４が接続する変曲点３７を基準としてレンズ１０の外部に出射する光の屈折角が急激に変わるようになるため、略変曲点３７の上方領域に出射する光は顕著に減少することとなり、それによって暗部領域Ｃが形成されるのである。   Explaining in detail, as can be seen from the drawing, the first exit surface 32 has a curved surface shape that is convex downward, and the second emission surface 34 has a curved surface shape that is convex upward, so that the first emission surface A difference is generated between the refraction angle of the light L3 emitted to the outside of the lens 10 through 32 and the refraction angle of the light L4 emitted to the outside of the lens 10 through the second emission surface 32. Thus, the first emission Since the refraction angle of light emitted to the outside of the lens 10 changes rapidly with respect to the inflection point 37 where the surface 32 and the second emission surface 34 are connected, the light emitted to a region above the substantially inflection point 37 Is significantly reduced, thereby forming a dark area C.

一方、図示してはいないが、ＬＥＤ１１の光軸１２部位でホットスポットｈが発生する理由は、出射面３０を通してレンズ１０の外部に出射する時に発生するフレネル反射（Ｆｒｅｓｎｅｌ ｒｅｆｌｅｃｔｉｏｎ）によるものである。   On the other hand, although not shown, the reason why the hot spot h is generated at the optical axis 12 of the LED 11 is due to Fresnel reflection that occurs when the light is emitted to the outside of the lens 10 through the emission surface 30.

即ち、フレネル反射（Ｆｒｅｓｎｅｌ ｒｅｆｌｅｃｔｉｏｎ）は、屈折率の異なる物質間で光が境界面を通過する時に生じる反射であるが、このようなフレネル反射によって、出射面３０を通して出射する光のうち一部は底面２０に反射するようになり、このように底面２０に反射された光は、また底面２０から反射して略光軸１２部位に向かうようになるが、このような光によって光軸１２部位でホットスポットｈが発生するようになるのである。   That is, Fresnel reflection is reflection that occurs when light passes through an interface between substances having different refractive indices, but some of the light emitted through the exit surface 30 by such Fresnel reflection is The light reflected from the bottom surface 20 in this way is reflected again from the bottom surface 20 and is directed substantially to the optical axis 12 site, but such light causes the light to be reflected at the optical axis 12 site. A hotspot h will be generated.

図６は、本発明の他の実施例に係るＬＥＤレンズを示す垂直断面図であり、図７は、図６の変曲点部位を拡大した図であって、図６の「Ａ」領域を拡大した図であり、図８は、図６の概略的な平面図である。   FIG. 6 is a vertical cross-sectional view showing an LED lens according to another embodiment of the present invention, and FIG. 7 is an enlarged view of the inflection point portion of FIG. FIG. 8 is an enlarged view, and FIG. 8 is a schematic plan view of FIG.

本実施例に係るＬＥＤレンズ４０は、図１に係るレンズ１０の配光分布上で発生する問題点、即ち、ＬＥＤ１１の光軸１２近くで円形の帯状の暗部ｂが発生する現象と、光軸１２部位でホットスポットｈが発生する現象を改善するためのものであって、図１に係るレンズ１０と比較して変曲点３７を除去する代わりに変曲点３７部位に凸部４２を形成させるという点で差があるので、その他の構成についての詳細な説明と図面符号は、図１に係るレンズ１０についての詳細な説明と図面符号を援用する。   The LED lens 40 according to the present embodiment has a problem that occurs on the light distribution of the lens 10 according to FIG. 1, that is, a phenomenon in which a circular band dark portion b occurs near the optical axis 12 of the LED 11, It is for improving the phenomenon that the hot spot h is generated at 12 sites, and instead of removing the inflection point 37 in comparison with the lens 10 according to FIG. Because there is a difference in that it allows the detailed description of the other components and the reference numerals of the drawings, the detailed description of the lens 10 according to FIG.

図６乃至図８を参照すると、本実施例に係るＬＥＤレンズ４０は、変曲点３７部位に形成され、垂直断面上、上方に凸な形状を有する凸部４２を含む。   6 to 8, the LED lens 40 according to the present embodiment includes a convex portion 42 formed at the inflection point 37 and having a convex shape on the vertical cross section.

このように、変曲点３７部位に凸部４２を形成すれば、図３および図４から見られるような、図１に係るレンズ１０の配光分布上で発生する円形の帯状の暗部ｂを改善することができる。   As described above, when the convex portion 42 is formed at the inflection point 37, the circular band-like dark portion b generated on the light distribution of the lens 10 according to FIG. 1 as seen from FIGS. 3 and 4 can be obtained. It can be improved.

詳細に説明すると、図７から見られるように、変曲点３７部位に凸部３７を形成すれば、変曲点３７部位を通してレンズ４０の外部に出射する光Ｌ５は、凸部３７を通して出射するようになることで、凸部３７のない場合に発生する暗部領域Ｃの方向に屈折して出射することとなり、それによって、暗部領域Ｃにより発生する配光分布上での円形の帯状の暗部ｂを改善できるようになる。   More specifically, as can be seen from FIG. 7, when the convex portion 37 is formed at the inflection point 37, the light L5 emitted to the outside of the lens 40 through the inflection point 37 is emitted through the convex portion 37. As a result, the light is refracted and emitted in the direction of the dark area C which occurs when there is no convex portion 37, whereby the circular band-like dark area b on the light distribution generated by the dark area C Will be able to improve.

さらに、変曲点３７に形成された凸部４２は、出射面３０からフレネル反射した光が底面１３からまた反射してＬＥＤの光軸１２に向かう光を分散させるか（ｓｃａｔｔｅｒｉｎｇ）、または変曲点３７の上方に集まるようにすることで、図３および図４から見られるような、図１に係るレンズ１０の配光分布上で発生する光軸１２部位でのホットスポットｈを改善できるようになる。   Furthermore, the convex portion 42 formed at the inflection point 37 scatters or inflects the light reflected by the Fresnel surface from the emission surface 30 again from the bottom surface 13 toward the light axis 12 of the LED By gathering above the point 37, it is possible to improve the hot spot h at the 12 optical axis spots generated on the light distribution of the lens 10 according to FIG. 1 as seen from FIG. 3 and FIG. become.

また、図８から見られるように、凸部４２は、変曲点３７部位、即ち、変曲点３７を囲むように形成されるが、それによって、凸部４２は、平面上、ＬＥＤ１１の光軸１２を中心とする円形の形態で存在する変曲点３７を囲む円形の帯状に形成され得る。   Further, as seen from FIG. 8, the convex portion 42 is formed so as to surround the inflection point 37, that is, the inflection point 37, whereby the convex portion 42 is light of the LED 11 on a plane. It can be formed in the shape of a circular strip surrounding the inflection point 37 present in the form of a circle centered on the axis 12.

もちろん、図示してはいないが、凸部４２は、円形の帯状に形成されず、平面上、円形の形態で存在する変曲点３７の円周方向に所定間隔離隔した状態で複数個形成されてもよい。   Of course, although not shown, the convex portions 42 are not formed in a circular band shape, but a plurality of convex portions 42 are formed at predetermined intervals in the circumferential direction of the inflection points 37 existing in a circular shape on a plane. May be

しかし、図８から見られるように、凸部４２は、変曲点３７を囲む円形の帯状に形成されることが、円周方向に所定間隔離隔した状態で複数個形成されるより、光をさらに均一に拡散させることができるので好ましい。   However, as can be seen from FIG. 8, the convex portion 42 is formed in a circular band shape surrounding the inflection point 37, rather than a plurality of convex portions 42 formed in a state of being separated by a predetermined interval in the circumferential direction. It is preferable because it can be diffused more uniformly.

図９は、本発明のまた他の実施例に係るＬＥＤレンズを示す垂直断面図であり、図１０は、図９の概略的な平面図である。   FIG. 9 is a vertical cross-sectional view of an LED lens according to another embodiment of the present invention, and FIG. 10 is a schematic plan view of FIG.

図９および図１０を参照すると、本実施例に係るＬＥＤレンズ４０は、凸部４２の他に、凸部４２と同様に、垂直断面上、上方に凸な形状を有する第１凸部４３と第２凸部４４をさらに含むことができる。   Referring to FIGS. 9 and 10, the LED lens 40 according to the present embodiment includes, in addition to the convex portion 42, a first convex portion 43 having a convex shape on the vertical cross section in the same manner as the convex portion 42. The second protrusion 44 may be further included.

第１凸部４３は、凸部４２から第１出射面３２側に所定距離離隔した状態で第１出射面３２上に形成され得、第２凸部４４は、凸部４２から第２出射面３４側に所定距離離隔した状態で第２出射面３４上に形成され得る。   The first convex portion 43 may be formed on the first emission surface 32 at a predetermined distance from the convex portion 42 toward the first emission surface 32, and the second convex portion 44 may be formed from the convex portion 42 to the second emission surface. It may be formed on the second emission surface 34 in a state of being separated by a predetermined distance on the 34 side.

また、図１０から見られるように、第１凸部４３と第２凸部４４は、凸部４２と同様に、平面上、ＬＥＤ１１の光軸１２を中心とする円形の帯状に形成され得る。   Further, as can be seen from FIG. 10, the first convex portion 43 and the second convex portion 44 can be formed in a circular strip shape centered on the optical axis 12 of the LED 11 on a plane, similarly to the convex portion 42.

このように、凸部４２の他に第１凸部４３と第２凸部４４をさらに形成すれば、図１に係るレンズ１０のように光軸１２近くで円形の帯状の暗部ｂが発生する現象をさらに改善できるようになる。   As described above, when the first convex portion 43 and the second convex portion 44 are further formed in addition to the convex portion 42, a circular strip-like dark portion b is generated near the optical axis 12 like the lens 10 according to FIG. The phenomenon can be further improved.

特に、凸部４２の他に第１凸部４３と第２凸部４４をさらに形成するようになれば、出射面３０からフレネル反射した光が底面１３からまた反射してＬＥＤの光軸１２に向かう光をさらに分散させることができるので、図１に係るレンズ１０のように光軸１２部位でホットスポットｈが発生する現象をさらに改善できるようになる。   In particular, if the first convex portion 43 and the second convex portion 44 are further formed in addition to the convex portion 42, the light which is Fresnel-reflected from the emission surface 30 is also reflected from the bottom surface 13 and is reflected to the optical axis 12 of the LED. Since the traveling light can be further dispersed, it is possible to further improve the phenomenon that the hot spot h occurs at the optical axis 12 as in the lens 10 according to FIG.

また、第１凸部４３と第２凸部４４は、垂直断面上、凸部４２を基準として互いに対称をなすように形成され得る。すると、光軸１２近くで暗部ｂが発生する現象と、光軸１２部位でホットスポットｈが発生する現象をより一層改善できるようになる。   In addition, the first convex portion 43 and the second convex portion 44 may be formed to be mutually symmetrical with respect to the convex portion 42 on the vertical cross section. Then, the phenomenon that the dark part b occurs near the optical axis 12 and the phenomenon that the hot spot h occurs at the optical axis 12 can be further improved.

図１１は、図９に係るレンズを通して出射する光の配光分布をシミュレーションした結果を示す図であり、図１２は、図１１の「Ｂ」部分を拡大した図である。   11 is a view showing a simulation result of light distribution of light emitted through the lens according to FIG. 9, and FIG. 12 is an enlarged view of a “B” part of FIG.

図１１および図１２から見られるように、本実施例に係るレンズ４０の配光分布は、図１に係るレンズ１０の配光分布を示す図３および図４と比較して、光軸１２近くでの暗部ｂの発生現象と、光軸１２部位でのホットスポットｈの発生現象が改善されたことが分かる。   As can be seen from FIGS. 11 and 12, the light distribution of the lens 40 according to the present embodiment is closer to the optical axis 12 as compared to FIGS. 3 and 4 showing the light distribution of the lens 10 according to FIG. It can be seen that the generation phenomenon of the dark part b in the above and the generation phenomenon of the hot spot h at the 12 portions of the optical axis are improved.

即ち、図３および図４の画面上で光軸１２近くに円形の帯である暗部ｂが発生していたのが、図１１および図１２の画面上では暗部ｂが周辺と比較してほぼ区別がつかない程度に改善されたことを確認することができる。   That is, although the dark portion b which is a circular band is generated near the optical axis 12 on the screens of FIGS. 3 and 4, the dark portion b is substantially distinguished from the periphery on the screens of FIGS. It can be confirmed that it has been improved to the extent that it can not be

特に、図３および図４のグラフで光軸１２の両側にショルダー形態が発生していたのが、図１１および図１２のグラフでは前記ショルダー形態がほとんどなくなったことを確認することができるが、グラフで前記のようなショルダー形態が発生するということは、周囲より暗い暗部ｂが発生するということを意味するため、図１１および図１２のグラフで前記ショルダー形態がなくなったということは、暗部ｂの発生現象が改善されたことを示す。   In particular, although the shoulder form was generated on both sides of the optical axis 12 in the graphs of FIG. 3 and FIG. 4, it can be confirmed that the shoulder form is almost lost in the graphs of FIG. 11 and FIG. The occurrence of the shoulder shape as described above in the graph means that a dark portion b darker than the periphery is generated, and the absence of the shoulder shape in the graphs of FIGS. 11 and 12 means the dark portion b. Indicates that the occurrence phenomenon of has been improved.

また、図３および図４の画面上での光軸１２部位の明るさよりも図１１および図１２の画面上での光軸１２部位の明るさがより明るくないことを確認することができるが、これは、光軸１２部位でのホットスポットｈの発生現象が改善されたことを示す。   Also, it can be confirmed that the brightness of the optical axis 12 site on the screens of FIGS. 11 and 12 is not brighter than the brightness of the optical axis 12 site on the screens of FIGS. 3 and 4. This indicates that the generation phenomenon of the hot spot h at the optical axis 12 is improved.

特に、図３および図４のグラフで光軸１２部位が上に尖っている形態であったのが、図１１および図１２のグラフではフラットな形態に変更されたことを確認することができるが、これは、光軸１２部位でのホットスポットｈの発生現象が改善されたことを示す。   In particular, although the graph of FIGS. 3 and 4 has a configuration in which the optical axis 12 portion is pointed upward, it can be confirmed that the graphs of FIGS. 11 and 12 have been changed to a flat configuration. This indicates that the generation phenomenon of the hot spot h at the optical axis 12 is improved.

以上において検討したように、本発明は、変曲点部位に凸部を形成することで、ＬＥＤの光軸近くで円形の帯状の暗部が発生する現象と、ＬＥＤの光軸部位でのホットスポットが発生する現象を改善できるＬＥＤレンズに関するものであって、その実施形態は、様々な形態に変更可能であるといえる。従って、本発明は、本明細書において開示された実施例により限定されず、本発明の属する技術の分野における通常の知識を有する者が変更可能な全ての形態も本発明の権利範囲に属するといえる。   As discussed above, according to the present invention, by forming the convex portion at the inflection point, a circular band dark portion occurs near the optical axis of the LED, and a hot spot at the optical axis of the LED The present invention relates to an LED lens that can improve the phenomenon that occurs, and the embodiment can be changed to various forms. Accordingly, the present invention is not limited by the embodiments disclosed herein, and all forms that can be modified by those skilled in the art to which the present invention belongs also belong to the scope of the present invention. It can be said.

Claims (1)

ＬＥＤから出る光を均一に拡散させるためのＬＥＤレンズにおいて、
前記ＬＥＤから出る光がレンズの内部に入射する入射面と、前記入射面を通して前記レンズの内部に入射した光を前記レンズの外部に出射させる出射面とを含み、
前記出射面は、
前記ＬＥＤの光軸を含む中心領域に形成され、垂直断面上、前記ＬＥＤの側に凸な曲面形状を有する第１出射面と、
前記第１出射面を囲む縁領域に形成され、垂直断面上、前記ＬＥＤの反対側に凸な曲面形状を有する第２出射面と、
前記第１出射面と前記第２出射面の接続部分に存在し、平面上で前記ＬＥＤの光軸を中心とする円形の形態で存在する変曲点と、
前記変曲点の部位に帯状に形成され、垂直断面上、前記ＬＥＤの反対側に凸な形状とされ、入射する光を前記変曲点が存在する場合に発生する暗部領域に屈折させて出射させる凸部と、
前記凸部から前記第１出射面の側に所定距離離隔した状態で前記第１出射面の上に形成され、垂直断面上、前記ＬＥＤの反対側に凸な形状を有する第１凸部と、
前記凸部から前記第２出射面の側に所定距離離隔した状態で前記第２出射面の上に形成され、垂直断面上、前記ＬＥＤの反対側に凸な形状を有する第２凸部と、を含み、
前記第１凸部および前記第２凸部は、平面上、円形の帯状を有し、垂直断面上、前記凸部を基準として互いに対称をなすことを特徴とする、ＬＥＤレンズ。 In the LED lens for uniformly diffusing the light emitted from the LED,
The incident surface through which the light emitted from the LED enters the inside of the lens, and the exit surface through which the light incident on the inside of the lens through the incident surface is emitted to the outside of the lens;
The emission surface is
A first emission surface formed in a central region including the optical axis of the LED, and having a curved surface shape convex toward the LED on a vertical cross section;
A second emission surface formed in an edge region surrounding the first emission surface and having a curved surface shape convex on the opposite side of the LED on a vertical cross section;
A point of inflection which exists in the connection portion between the first emission surface and the second emission surface, and exists in a circular form centered on the optical axis of the LED on a plane;
A band is formed at the inflection point , has a convex shape on the opposite side of the LED on the vertical cross section, and refracts incident light to a dark area generated when the inflection point is present and exits. And the convex part
A first convex portion which is formed on the first emission surface in a state of being separated by a predetermined distance from the convex portion on the side of the first emission surface, and has a convex shape on the opposite side of the LED on a vertical cross section;
A second convex portion which is formed on the second emission surface in a state of being separated from the convex portion toward the second emission surface by a predetermined distance, and which has a convex shape on the opposite side of the LED on a vertical cross section; Including
An LED lens characterized in that the first convex portion and the second convex portion have a circular band shape on a plane, and are symmetrical with respect to the convex portion on a vertical cross section.
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